P802.1Qcr – Bridges and Bridged Networks Amendment: Asynchronous Traffic Shaping
The full title of this PAR is “Standard for Local and Metropolitan Area Networks – Bridges and Bridged Networks Amendment: Asynchronous Traffic Shaping”.
This project specifies procedures and managed objects for bridges and end stations to perform asynchronous traffic shaping over full-duplex links with constant data rates.
Asynchronous traffic shaping can be modeled as an additional layer of shaped egress queues to merge flows into the existing queue structure. The required minimum number of independent queues at an egress port is adjustable and is at least the number of ingress ports of the particular bridge that require merging.
The amendment specifies an information model for the capabilities of asynchronous traffic shaping. It further specifies a YANG data model and Management Information Base (MIB) modules both based on that information model to support configuration and status reporting. It further defines the relationship between the models introduced by this amendment, and the models in the base standard.
Additionally, this amendment provides an informative framework for worst case delay analysis in static networks with static configurations. This amendment also addresses errors and omissions in the description of existing functionality.
There is well defined traffic that requires zero congestion loss and deterministic latency. Current bridging standards do not provide a sufficiently fine grained asynchronous traffic mechanism to meet these requirements without using network topology information. This project specifies mechanisms that do not rely on synchronous communication, thereby providing independence from clock synchronization mechanisms and higher link utilization than synchronous mechanisms.
Current Status
| Status | Published |
| Published Standard | IEEE Std 802.1Qcr-2020 |
| PAR & CSD | Full title: Draft Standard for Local and Metropolitan Area Networks: Amendment: Hot Standby — Bridges and Bridged Networks — Amendment: Asynchronous Traffic Shaping PAR (Approved: 27 Sep 2018; Expires: 31 Dec 2020) CSD |
| Editor | Johannes Specht |
Archive
Contributions
Important NOTICE on contributions.
| Date | Document |
|---|---|
| 21 May 2015 | Presentation new-tsn-specht-ubs-queues-0521-v0.pdf |
| 24 May 2016 | Presentation Qcr-specht-specification-mapping-proposal-0516-v01.pdf |
| 27 Jul 2016 | Presentation cr-nadas-combining-ATS-and-SRS-0716-v01.pdf |
| 13 Sep 2016 | Presentation cr-nadas-combining-ATS-and-SRS-0916-v01.pdf |
| 10 Nov 2016 | Presentation Qcr-specht-editing-1116-v01.pdf |
| 12 Dec 2016 | Presentation cr-nadas-SRS-for-TSN-use-cases-1216-v01.pdf |
| 21 Feb 2017 | Presentation cr-seaman-paternoster-policing-scheduling-0217-v02.pdf |
| 13 Mar 2017 | Presentation cr-seaman-paternoster-policing-scheduling-0317-v03.pdf |
| 15 Mar 2017 | Presentation cr-seaman-paternoster-ppt-0317-v01.pdf |
| 06 Nov 2017 | Presentation cr-specht-yang-1117-v01.pdf |
| 22 May 2018 | Presentation cr-specht-d04-0518-v03.pdf |
| 11 Sep 2018 | Presentation cr-specht-d0-5-last-comments-v00.pdf |